html,body{
    margin:0;padding:0;
}
.header{
    width:100%;
    background:whitesmoke;
    text-align: center;
    line-height: 30px;
}
.tab-box{
    width:100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-flow:row wrap;
    background: rgba(10,140,60,0.8);
}
.tab-box a{
    color:white;
}
.tab-box li{
    width: auto;
    margin:10px 20px;
    flex-grow:0;
    flex-shrink: 0;
}
.box{
    padding:15px 15px;
    border:1px dotted #ccc;
}